EP 2325446 B1 20170802 - Method for production of valve head portion of a hollow engine valve and a hollow engine valve
Title (en)
Method for production of valve head portion of a hollow engine valve and a hollow engine valve
Title (de)
Verfahren zur Herstellung eines Kopfteils eines hohles Motorventils und hohles Motorventil
Title (fr)
Procédé de fabrication d'une partie de la tête d'une soupage creuse de moteur et soupape creuse de moteur
Publication
Application
Priority
- JP 2009066285 W 20090917
- JP 2008239082 A 20080918
- JP 2008272079 A 20081022
Abstract (en)
[origin: EP2325446A1] Forming of a valve head portion (1) of a hollow engine valve (V) comprising a material particularly satisfactory in heat resistance is performed by cold forging. On this occasion, the material with excellent heat resistance is worked to form a valve head portion semifinished product (11) having a hollow hole (Sll) whose inner diameter (Æ11) is equal to the maximum inner diameter (Æ 11) of a hollow hole (Sl) of a finished product of the valve head portion (1), and having a diameter-increased section (111) whose maximum outer diameter (Æ 12) is equal to the maximum outer diameter (Æ12) of a diameter-increased section (la) of the finished product. Parts of the valve head portion semifinished product other than a central part to a lower part of the diameter-increased section (111) are necked down by cold forging performed a plurality of times to obtain the finished product of the valve head portion (1). This method of obtaining the finished product is provided by the present invention.
IPC 8 full level
CPC (source: EP KR US)
B21D 53/84 (2013.01 - EP US); B21K 1/22 (2013.01 - EP US); B23K 11/0935 (2013.01 - EP US); B23P 15/002 (2013.01 - EP US); F01L 3/14 (2013.01 - EP KR US); F01L 3/16 (2013.01 - EP US); F01L 3/24 (2013.01 - KR); F01L 2303/00 (2020.05 - EP US); Y10T 29/49307 (2015.01 - EP US); Y10T 29/49309 (2015.01 - EP US); Y10T 29/49405 (2015.01 - EP US)
Citation (examination)
JP 2009185655 A 20090820 - TOYOTA MOTOR CORP
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
DOCDB simple family (publication)
EP 2325446 A1 20110525; EP 2325446 A4 20130619; EP 2325446 B1 20170802; CN 102159799 A 20110817; CN 102159799 B 20130501; JP 2010094732 A 20100430; JP 4390291 B1 20091224; KR 101247896 B1 20130326; KR 20110059617 A 20110602; PL 2325446 T3 20180131; US 2011174259 A1 20110721; US 2013313463 A1 20131128; US 2014033532 A1 20140206; US 8522434 B2 20130903; US 9194263 B2 20151124; US 9447711 B2 20160920; WO 2010032799 A1 20100325
DOCDB simple family (application)
EP 09814643 A 20090917; CN 200980136375 A 20090917; JP 2008272079 A 20081022; JP 2009066285 W 20090917; KR 20117006196 A 20090917; PL 09814643 T 20090917; US 200913119501 A 20090917; US 201313955635 A 20130731; US 201313955815 A 20130731